火炮装填系统协调输弹机构磨损特性

Wear Characteristics of Coordinated Ammunition Ramming Mechanism in Automatic Ammunition Loading System for Artillery

在自动装填系统中,协调输弹机构是完成弹丸转运的重要组成部分。由于协调输弹机构长期处于发射冲击的载荷作用之下,导致协调器运动副轴孔之间由于磨损作用出现间隙变化,影响协调输弹的精度,研究协调输弹机构运动磨损问题对提高机构运动可靠性具有重要意义。为了研究协调输弹机构的磨损特性,基于修正Archard磨损模型建立协调输弹机构磨损数学模型并通过实验获得磨损系数;建立协调输弹机构动态响应有限元仿真模型并通过实验数据验证其有效性;利用有限元仿真结合任意朗格朗日-欧拉(Arbitrary Lagrangian-Eulerian,ALE)自适应网格技术实现磨损过程仿真,从而获得协调输弹机构的磨损特性,包括磨损深度与磨损循环次数的关系、最大磨损深度出现的位置等。研究结果表明:磨损开始初期磨损剧烈,在大约350次协调输弹后磨损由剧烈磨损期转而进入平稳期,磨损率下降;随着磨损的继续进行磨损率持续下降,且在整个磨损过程中轴孔接触边缘比其他位置磨损深度更大。

The coordinated ammunition ramming mechanism in the automatic ammunition loading system is an important part to complete the ammunition transfer.Due to the long-term impact loads during firings,the countershaft holes of the coordinated ammunition ramming mechanism experience wear-induced clearance variations,affecting the accuracy of ammunition coordination.Studying the wear of the coordinated ammunition ramming mechanism is crucial for enhancing its reliability.To investigate the wear characteristics of the coordinated ammunition ramming mechanism,a mathematical model based on the modified Archard wear model is developed,and the wear coefficient is determined through experiments.A finite element simulation model for the mechanism s dynamic response is established and validated using experimental data.The finite element simulation and the Arbitrary Lagrangian-Eulerian(ALE)adaptive grid technology are used to simulate the wear process,revealing the mechanism s wear characteristics,such as the relationship between wear depth and cycle count,and the location of maximum wear.The results indicate that the initial wear is intense.After approximately 350 coordinated ammunition transfers,the wear transits from intense to steady,with the wear rate decreasing as the wear process continues.Wear at the contact edge of shaft hole is more pronounced than elsewhere throughout the wear process.